| 摘要 |
PURPOSE:To obtain a molding material excellent in rapid curability, cracking resistance, molding stability and molding appearance by mixing a mixed resin of a melamine resin with a self-curing phenolic resin with pulp, a specified inorganic filler and a latent curing catalyst. CONSTITUTION:A melamine resin molding material is obtained by mixing 100 pts.wt. mixture comprising 70-90wt.% melamine resin of a formaldehyde to melamine molar fraction of 1.5-2.5 and a number-average MW of 200-320 with 10-30wt.% self-curing phenolic resin with 30-50pts.wt. pulp of a fiber length <=0.15mm, 10-45 pts.wt. inorganic filler comprising at least one member selected form among calcium carbonate, barium sulfate, talc and clay and 0.1-1.2 pts.wt. latent curing catalyst. The latent curing catalyst is necessary for obtaining a moderate curing rate during molding and an amyl alcohol salt of imidodisulfonic acid is desirable. |
